单项选择题

Make sure that all the papers ______ proofread for grammatical and content errors before submitting them to the boss.

(A) will be
(B) were
(C) are
(D) has been
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单项选择题
______ the fact that different prices affect different people, there are many varying measures of inflation in use.
(A) Because
(B) Since
(C) As
(D) Due to
单项选择题
During construction of the new apartment building next to ours, we cannot be held ______ for any damage from falling objects.
(A) responsibility
(B) responsible
(C) responsibly
(D) response
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